reciprocity law

(redirected from Reciprocity laws)
Also found in: Encyclopedia.

Bun·sen-Ros·coe law

(bŭn'sĕn ros'kō),
in two photochemical reactions, for example, the darkening of a photographic plate or film, if the products of the intensity of illumination and the time of exposure are equal, the quantities of chemical material undergoing change will also be equal; the retina for short periods of exposure obeys this law.
Farlex Partner Medical Dictionary © Farlex 2012

reciprocity law

Any milliamperage multiplied by an exposure time setting that gives the same milliamperage-second outcome should give the same relative density to an image. However, this law is dramatically affected by the image receptor response curve, esp. when it is not a 45° linear curve. In radiographic intensifying film and screen technologies, the reciprocity law does not hold at long exposure times because of the reversal of the D log E response curve.
See also: law
Medical Dictionary, © 2009 Farlex and Partners


Robert W., German chemist and physicist, 1811-1899.
Bunsen burner - a gas lamp giving a very hot but only slightly luminous flame.
Bunsen solubility coefficient - the milliliters of gas STPD dissolved per milliliter of liquid and per atmosphere (760 mmHg) partial pressure of the gas at any given temperature.
Bunsen-Roscoe law - in two photochemical reactions, if the product of the intensity of illumination and the time of exposure are equal, the quantities of chemical material undergoing change will be equal. Synonym(s): reciprocity law; Roscoe-Bunsen law
Roscoe-Bunsen law - Synonym(s): Bunsen-Roscoe law
Medical Eponyms © Farlex 2012
References in periodicals archive ?
A law enabling foreign citizens to buy property in Turkey -- known as the reciprocity law -- came into force last year after passing through Parliament and the Cabinet.
According to the reciprocity law, the citizens of some countries can purchase property in Turkey unconditionally while there are restrictions on qualifying to buy property for citizens of 31 countries.
A few years later, Schwarzschild, an astronomer, proposed a modification of the reciprocity law that fit his low intensity, stellar data.
Note that when p = 1, the Schwarzschild law and the reciprocity law are identical; hence, the Schwarzchild's law is a generalization of the reciprocity law.
One of the first experiments to be carried out on the SPHERE was to ascertain the relationship between the UV irradiance and the photoresponse of a polymeric system, and to subsequently determine whether the reciprocity law is valid for this particular material.
Most state reciprocity laws expressly allow wineries and consumers to avoid the excise tax.
In the late 1960s, Robert Langlands, now at the Institute for Advanced Study in Princeton, N.J., described how such reciprocity laws might work in a general context in number theory, in which integers represent a special case.
The more recent flavors of reciprocity laws DO NOT generally authorize direct mail solicitation and sales programs.
More recently, however, the California ABC ruled that Washington's reciprocity law was so different from California's law as not to be reciprocal.
With the concepts of generalized reciprocity laws as the endpoint, the text describes the definitions and constructions in modern algebra and number theory, the notion of representation, solving Diophantine equations, Galois theory, elliptic curves, matrices, groups of matrices and representation of groups.
Since the 1986 passage in California of the original reciprocity legislation, the Wine Institute says that 12 states have adopted reciprocity laws. Similar bills are pending in New York and Iowa, but Arizona and Virginia recently struck down proposed direct-shipping legislation.
He starts by covering the classical theorems, then describes the integral domain of rational integers, Euclidean domains, rings of polynomials and former power series, the Chinese remainder theorem and the evaluation of a number of solutions of a linear congruence with side conditions, reciprocity laws, and finite groups.